Dimensions 9m (29 feet) * 4,2 m (14 feet). I would like to build benches in the poly tunnel. The last few years where a bit time consuming and having no problems with wintering before i delayed the work a bit. The top shelves outside are loose, so i only have to build the bases. One day of work i think. I do use the greenhouse in summer for a pool for the kids. So first i will have to look how much space i leave for that.